Joomdle Web Services - An unexpected error happened: 2360449

Hello, could you please help with my problem - when I open "Joomdle: System check" I see the Joomdle Web Services error-message "An unexpected error happened: 23604497: Can not find data record in database table external_functions. (SELECT * FROM {external_functions} WHERE name = ? [array ( 0 => 'joomdle_system_check', )]) | DEBUG INFO: SELECT * FROM {external_functions} WHERE name = ? [array ( 0 => 'joomdle_system_check', )] | ERRORCODE: invalidrecord".
Also, if I click Users (/administrator/index.php?option=com_joomdle&view=users) there is a white screen with the same error: "XML-RPC Error (23604497): Can not find data record in database table external_functions. (SELECT * FROM {external_functions} WHERE name = ? [array ( 0 => 'joomdle_get_moodle_users_number', )]) | DEBUG INFO: SELECT * FROM {external_functions} WHERE name = ? [array ( 0 => 'joomdle_get_moodle_users_number', )] | ERRORCODE: invalidrecordd".

What could be the cause?

system info:
Moodle - version 3.1 is required and you are running 3.6.2+ (Build: 20190124)
Joomla - Joomla! 3.9.2

Hi.

It seems that for some reason, functions were not added to service at Joomdle installation in Moodle, although I don't know why, as I did not see this error before.
Please check Moodle admin->Plugins->Web services->External services and see if Joomdle service was created. If it was, check its functions, I guess it will be empty.
If that's the case, you can try uninstalling Joomdle in Moodle, and installing it again,to see if functions get correctly added.

Thanks, there was no Joomdle service in External services.
I reinstalled Moodle (the latest version from moodle.org) and installed Joomdle in Moodle - and after the installation it was some errors: "Exception - Call to undefined method cache_disabled::purge_current_user()".
What could be the root of this problem?

Please check here:
www.joomdle.com/forum/installation/12450...-with-database-error

Bug is reported on Moodle, although there is not an official reply yet. You can try using the fix provided above at your own discretion.
We'll wait to see if there's a reply, and otherwise we may need to change our installation method for a future release.

Thank you very much, it works! The problem was in user/lib.php — I fixed it and then installed Joomdle without errors.

Great, thanks for the feedback.